:root {
  color-scheme: dark;
  --primary: #a6c8ff;
  --on-primary: #003258;
  --primary-container: #00497d;
  --on-primary-container: #d1e4ff;
  --secondary: #b9c8da;
  --on-secondary: #24323f;
  --secondary-container: #3a4856;
  --on-secondary-container: #d5e4f7;
  --tertiary: #d2c2e8;
  --on-tertiary: #38274d;
  --tertiary-container: #4f3d64;
  --on-tertiary-container: #eedcff;
  --error: #ffb4ab;
  --on-error: #690005;
  --error-container: #93000a;
  --on-error-container: #ffb4ab;
  --background: #111a24;
  --on-background: #e1e2e8;
  --surface: #0e141b;
  --on-surface: #e1e2e8;
  --surface-variant: #41474f;
  --on-surface-variant: #c1c7d0;
  --outline: #8b919a;
  --outline-variant: #41474f;
  --shadow: #000000;
  --scrim: #000000;
  --inverse-surface: #e1e2e8;
  --inverse-on-surface: #2e3136;
  --inverse-primary: #00629b;
  --surface-dim: #0e141b;
  --surface-bright: #343a42;
  --surface-container-lowest: #090f16;
  --surface-container-low: #161c23;
  --surface-container: #1a2028;
  --surface-container-high: #252b33;
  --surface-container-highest: #30363e;
}

:root {
  --spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --emphasized: cubic-bezier(0.2, 0, 0, 1);
  --rail-width: 88px;
  --bar-height: 80px;
  --content-width: 1100px;
}

/* Reset */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  overflow-x: clip;
  scroll-behavior: smooth;
  scroll-padding-top: 1rem;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--surface);
  color: var(--on-surface);
  font-family: "Roboto Flex", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.5;
  padding-left: var(--rail-width);
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
p,
ul,
article,
figure {
  margin: 0;
  padding: 0;
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  border: 0;
  background: none;
  cursor: pointer;
}

/* Icons (Material Symbols Rounded, used through <i>) */
i {
  font-family: "Material Symbols Rounded";
  font-style: normal;
  font-weight: normal;
  font-size: 1.5rem;
  line-height: 1;
  letter-spacing: normal;
  text-transform: none;
  white-space: nowrap;
  word-wrap: normal;
  direction: ltr;
  font-feature-settings: "liga";
  -webkit-font-feature-settings: "liga";
  -webkit-font-smoothing: antialiased;
  display: inline-block;
  flex-shrink: 0;
  user-select: none;
}

main {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Accessibility */
.skip-link {
  position: fixed;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: 0.75rem 1.25rem;
  border-radius: 999px;
  background: var(--primary);
  color: var(--on-primary);
  font-weight: 700;
  transition: top 0.2s var(--emphasized);
}

.skip-link:focus {
  top: 1rem;
}

a:focus-visible,
summary:focus-visible,
button:focus-visible,
.gallery:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

/* Navigation: rail on desktop, bottom bar on mobile */
#navigation-bar {
  position: fixed;
  z-index: 50;
  inset: 0 auto 0 0;
  width: var(--rail-width);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 1rem 0;
  background: var(--surface-container-low);
}

.musify-nav-logo {
  position: absolute;
  top: 1.25rem;
}

.nav-logo {
  width: 48px;
  height: 48px;
  display: block;
}

#navigation-bar > a:not(.musify-nav-logo) {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  width: 100%;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--on-surface-variant);
}

#navigation-bar > a:not(.musify-nav-logo) i {
  width: 56px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  transition:
    background 0.2s ease,
    border-radius 0.35s var(--spring);
}

#navigation-bar > a:not(.musify-nav-logo):hover i {
  background: color-mix(in srgb, var(--on-surface) 10%, transparent);
}

#navigation-bar > a[aria-current] {
  color: var(--on-surface);
  font-weight: 700;
}

#navigation-bar > a[aria-current] i {
  background: var(--secondary-container);
  color: var(--on-secondary-container);
  font-variation-settings: "FILL" 1;
}

@media (max-width: 760px) {
  body {
    padding-left: 0;
    padding-bottom: calc(var(--bar-height) + env(safe-area-inset-bottom));
  }

  main {
    padding: 0 1rem;
  }

  #navigation-bar {
    inset: auto 0 0 0;
    width: 100%;
    height: calc(var(--bar-height) + env(safe-area-inset-bottom));
    padding: 0.75rem 0.5rem calc(0.75rem + env(safe-area-inset-bottom));
    flex-direction: row;
    justify-content: space-around;
    align-items: flex-start;
    gap: 0;
  }

  .musify-nav-logo {
    display: none;
  }

  #navigation-bar > a:not(.musify-nav-logo) {
    flex: 1;
    width: auto;
  }
}

/* Buttons */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 56px;
  padding: 0 1.75rem;
  border-radius: 28px;
  overflow: hidden;
  font-size: 1rem;
  font-weight: 700;
  transition:
    border-radius 0.3s var(--emphasized),
    transform 0.2s var(--emphasized),
    box-shadow 0.2s ease;
}

/* State layer */
.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: currentColor;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.btn i {
  transition: transform 0.3s var(--spring);
}

@media (hover: hover) {
  .btn:hover {
    border-radius: 16px;
  }

  .btn:hover::before {
    opacity: 0.08;
  }

  .btn-filled:hover {
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.35);
  }

  .btn:hover i {
    transform: scale(1.15);
  }
}

.btn:focus-visible::before {
  opacity: 0.1;
}

.btn:active {
  border-radius: 12px;
  transform: scale(0.97);
}

.btn:active::before {
  opacity: 0.12;
}

.btn-filled {
  background: var(--primary);
  color: var(--on-primary);
}

.btn-outlined {
  border: 1px solid var(--outline);
  color: var(--primary);
}

/* Logo tint */
.musify-logo {
  filter: brightness(-1) saturate(100%) invert(79%) sepia(17%) saturate(1134%)
    hue-rotate(183deg) brightness(104%) contrast(102%);
}

/* Hero */
.hero-section {
  position: relative;
  min-height: 92vh;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  align-items: center;
  gap: 2rem;
  padding: 3rem 0;
  overflow: clip;
  overflow-clip-margin: 0px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.4rem 1rem 0.4rem 0.5rem;
  margin-bottom: 1.5rem;
  border-radius: 999px;
  background: var(--secondary-container);
  color: var(--on-secondary-container);
  font-size: 0.85rem;
  font-weight: 600;
}

.hero-badge img {
  border-radius: 50%;
}

.hero-title {
  margin-bottom: 1.25rem;
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: -0.03em;
  font-variation-settings: "wdth" 110;
}

.hero-title span {
  color: var(--primary);
}

.hero-subtitle {
  max-width: 34rem;
  margin-bottom: 1rem;
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  font-weight: 500;
}

.hero-description {
  max-width: 34rem;
  margin-bottom: 2rem;
  line-height: 1.7;
  color: var(--on-surface-variant);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* Phones */
.hero-visual {
  position: relative;
  height: min(620px, 70vh);
  display: grid;
  justify-items: center;
  grid-template: 100% / 100%;
}

.phone {
  grid-area: 1 / 1;
  align-self: center;
  aspect-ratio: 9 / 19.5;
  height: 86%;
  padding: 8px;
  border-radius: 40px;
  background: var(--surface-container-highest);
  box-shadow:
    0 0 0 2px var(--outline-variant),
    0 30px 60px rgba(0, 0, 0, 0.55);
  overflow: hidden;
}

.phone img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 32px;
  display: block;
}

.phone-front {
  z-index: 2;
  translate: 38% 6%;
  --rot: 4deg;
  animation:
    phone-in 0.9s var(--spring) 0.45s both,
    float 6s ease-in-out 1.4s infinite;
}

.phone-back {
  translate: -38% -4%;
  opacity: 0.9;
  --rot: -7deg;
  animation:
    phone-in 0.9s var(--spring) 0.25s both,
    float 7s ease-in-out 1.2s infinite reverse;
}

.phone {
  rotate: var(--rot);
}

@keyframes phone-in {
  from {
    opacity: 0;
    transform: translateY(60px);
  }
}

@keyframes float {
  50% {
    transform: translateY(-14px);
  }
}

/* Scroll reveal */
.js .reveal {
  opacity: 0;
  transform: translateY(28px) scale(0.98);
}

.js .reveal.in {
  opacity: 1;
  transform: none;
  transition:
    opacity 0.7s var(--emphasized),
    transform 0.8s var(--spring);
  transition-delay: calc(var(--d, 0) * 80ms);
}

@media (max-width: 900px) {
  .hero-section {
    grid-template-columns: 1fr;
    min-height: auto;
    text-align: center;
    padding-top: 2rem;
  }

  .hero-subtitle,
  .hero-description {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-visual {
    height: 440px;
  }
}

/* Notice */
.notice-banner {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  max-width: 720px;
  margin: 0 auto 2rem;
  padding: 1.25rem 1.5rem;
  border-radius: 28px;
  background: var(--tertiary-container);
  color: var(--on-tertiary-container);
}

.notice-banner strong {
  display: block;
  margin-bottom: 0.25rem;
}

.notice-banner p {
  font-size: 0.9rem;
}

.notice-banner a {
  text-decoration: underline;
  font-weight: 600;
}

/* Sections */
.section {
  padding: 2rem 0 3rem;
}

.section-title {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin: 3rem auto 2rem;
  font-size: clamp(1.6rem, 4vw, 2.5rem);
  font-weight: 800;
  text-align: center;
}

.section-title i {
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  border-radius: 16px 50% 16px 50%;
  background: var(--primary-container);
  color: var(--on-primary-container);
}

.features-section,
.changelog-section {
  background: var(--surface-container-low);
  border-radius: 48px;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* Stats */
.stats-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  max-width: 900px;
  margin: 0 auto;
}

.stat-card {
  flex: 1 1 220px;
  max-width: 280px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  padding: 1.5rem;
  border-radius: 24px;
  background: var(--surface-container);
  transition:
    transform 0.4s var(--spring),
    border-radius 0.4s var(--spring);
}

.stat-card:hover {
  transform: translateY(-4px);
  border-radius: 40px;
}

.stat-card > i {
  font-size: 2rem;
  color: var(--primary);
}

.stat-content {
  text-align: center;
}

.stat-label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
}

.stat-card img {
  height: 24px;
}

/* Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

.feature-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  border-radius: 28px 8px 28px 8px;
  background: var(--surface-container);
  transition:
    transform 0.4s var(--spring),
    border-radius 0.4s var(--spring),
    background 0.2s ease;
}

.feature-card:nth-child(even) {
  border-radius: 8px 28px 8px 28px;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-radius: 28px;
  background: var(--secondary-container);
}

.feature-card > i {
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background: var(--primary-container);
  color: var(--on-primary-container);
}

.feature-card h3 {
  margin-bottom: 0.25rem;
  font-size: 1.1rem;
  font-weight: 700;
}

.feature-card p {
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--on-surface-variant);
}

/* Screenshot gallery (native scroll snap, centered focus) */
.gallery-wrap {
  position: relative;
}

.gallery {
  display: flex;
  gap: 24px;
  padding: 2.5rem calc(50% - min(135px, 34vw)) 1.5rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  overscroll-behavior-x: contain;
}

.gallery::-webkit-scrollbar {
  display: none;
}

.gallery li {
  --t: 1;
  flex: 0 0 min(270px, 68vw);
  scroll-snap-align: center;
  padding: 7px;
  border-radius: 40px;
  background: var(--surface-container-highest);
  box-shadow: 0 0 0 2px var(--outline-variant), 0 18px 40px rgba(0, 0, 0, 0.4);
  transform: scale(calc(1 - var(--t) * 0.12));
  opacity: calc(1 - var(--t) * 0.45);
  transition: box-shadow 0.3s ease;
}

.gallery li.is-active {
  box-shadow: 0 0 0 2px var(--primary), 0 24px 56px rgba(0, 0, 0, 0.55);
}

.gallery img {
  display: block;
  width: 100%;
  aspect-ratio: 9 / 19.5;
  object-fit: cover;
  border-radius: 33px;
}

.gallery-btn {
  position: absolute;
  top: 45%;
  z-index: 2;
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--secondary-container);
  color: var(--on-secondary-container);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  transition:
    transform 0.35s var(--spring),
    border-radius 0.35s var(--spring);
}

.gallery-btn:hover {
  border-radius: 16px;
  transform: scale(1.08);
}

.gallery-btn:active {
  transform: scale(0.9);
}

#gallery-prev {
  left: 0;
}

#gallery-next {
  right: 0;
}

.gallery-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
}

.gallery-dots span {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--outline-variant);
  transition:
    width 0.4s var(--spring),
    background 0.2s ease;
}

.gallery-dots span.is-active {
  width: 28px;
  background: var(--primary);
}

/* Steps */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.step-card {
  padding: 1.5rem;
  border-radius: 32px;
  background: var(--surface-container);
  transition:
    transform 0.4s var(--spring),
    border-radius 0.4s var(--spring);
}

.step-card:nth-child(2) {
  border-radius: 48px 16px 48px 16px;
}

.step-card:hover {
  transform: translateY(-4px) rotate(-0.5deg);
}

.step-number {
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  margin-bottom: 1rem;
  border-radius: 50% 16px 50% 16px;
  background: var(--tertiary-container);
  color: var(--on-tertiary-container);
  font-size: 1.25rem;
  font-weight: 800;
}

.step-card h3 {
  margin-bottom: 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
}

.step-card p {
  line-height: 1.6;
  color: var(--on-surface-variant);
}

/* FAQ */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-width: 760px;
  margin: 0 auto;
}

.faq-item {
  padding: 0 1.5rem;
  border-radius: 20px;
  background: var(--surface-container);
  transition:
    border-radius 0.35s var(--spring),
    background 0.2s ease;
}

.faq-item[open] {
  border-radius: 32px;
  background: var(--surface-container-high);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 0;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  font-size: 1.5rem;
  color: var(--primary);
  transition: transform 0.35s var(--spring);
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item p {
  margin-bottom: 1.25rem;
  line-height: 1.6;
  color: var(--on-surface-variant);
}

.faq-item a,
.doc a {
  color: var(--primary);
  text-decoration: underline;
}

/* Changelog */
.changelog-card {
  max-width: 720px;
  margin: 0 auto;
  padding: 1.5rem 2rem;
  border-radius: 24px;
  background: var(--surface-container);
}

#changelog_element p {
  padding: 0.35rem 0;
  font-size: 0.95rem;
}

/* Footer */
.site-footer {
  margin: 2rem 0 1rem;
  padding: 3rem 1.5rem;
  border-radius: 48px 48px 24px 24px;
  background: var(--surface-container-highest);
}

.footer-content {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.footer-brand img {
  width: 40px;
  height: 40px;
}

.footer-brand span {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.5rem;
  margin-bottom: 2rem;
}

.footer-links a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--on-surface-variant);
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--primary);
}

.footer-links i {
  font-size: 1.25rem;
}

.footer-copyright {
  font-size: 0.85rem;
  text-align: center;
  color: var(--outline);
}

/* Document pages */
.doc {
  max-width: 760px;
  margin: 0 auto;
  padding: 3rem 0 1rem;
  line-height: 1.7;
}

.doc-title {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.5rem;
  font-size: clamp(2rem, 6vw, 3.25rem);
  font-weight: 800;
  color: var(--primary);
}

.doc-title i {
  display: grid;
  place-items: center;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 20px 50% 20px 50%;
  background: var(--primary-container);
  color: var(--on-primary-container);
}

.doc-updated {
  margin-bottom: 2rem;
  color: var(--on-surface-variant);
}

.doc h2 {
  margin: 2.25rem 0 0.5rem;
  font-size: 1.4rem;
  font-weight: 700;
}

.doc ul {
  padding-left: 1.25rem;
  list-style: disc;
}

/* Small screens */
@media (max-width: 760px) {
  .features-section,
  .changelog-section {
    border-radius: 32px;
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .changelog-card {
    padding: 1rem 1.25rem;
  }

  .feature-card {
    padding: 1rem 1.25rem;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
}